Screed jack



Jam 13, 19351. E. G. BROSTRQM SCREED JACK Filed Dec. 20, 1,928

ATTURNEY Patented Jan. 13, 1931 UNITED fnnnnsr o. nnosrnom, or KDAIQNSAS c11 2, mrssouar sonnnn JACK .Application filed December zo, 1'eza. "sedative-327,383;

The present invention relatesto concrete construction work, and the principal object in view isto provide a novel and Gfi BQtIVG screed jacking device, adapted to be used along with the screed and ad] ustable for the purpose of effectingwhatever variations may I be required of'the position ofthe screed to bring it into properrelat'ion orallgnment with reference to the surface of the concrete 1 or finishing material. Accordingly, I have devise and placed in position immediately follow ing pouring of "the concrete material, or

mounted on the formworkin conjunction 2 with the screedbefore the pouring of the concrete.

lVith thesegeneral obj ectsin view, the invention will now be described by reference to the accompanying drawing, illustrating various practical forms of-embodiment of my improved device, after which the novel features and combinationsthereof will be set forth and claimed. I g

In the drawing I Figure 1 is a sectional perspective view. illustrating one vform of the improved device in operative the concrete material;

Figure 2 is a sectional elevation showing the same parts after pouring of, the concrete and adjustment of the device to adjust the position of the screed;

Figure 3 is an enlarged detail elevation of the device partly broken away to show the screw threads;

Figure 1 is an enlarged detail plan of the collar or washerelement;

Figure 5} is a sectional elevation on asmaller scale showing a modified form of the col- 5 lar or'washer element including a brac ng ex;

tension; 7 I

F gure 6 1s a plan view of said modlfied collar or washer element and bracing-extension Figures 7 and 8are fragmentary sectional views illustrating modified forms of the j ack-' a a-simple and 7 practical screed j ackingdevice. which is adaptposition ready for p'ouringof ing device adapted for attachment to the sides ofthescreed, a i F igure9 isaplan view of the form shown in Figure 8; i

Figure 10 is a sectional elevation on a smaller scale illustrating the-mode ofuse of said modified forms Figure 11 is an levation showing still an other form of the jacking device;

Figure 12 isa sectional elevation'showing' a still further form ofjacking device adapted to be set in the concretein advance of the screed; and f 1 Figure 13 is a similar view illustrating the method of mounting and attaching the screed.

Referring now to thedrawingin detail, this illustrates various forms of embodiment of the jacking device and their use in connection with concrete construction operations, as for example,where a concrete fioor is being poured over formwork 15 and screeds or sleepers 16 positioned in theconcrete material 17 at, a suitable distance above the formwork 15. In practice, the screeds or sleeperslG, which are to form the support for the wood flooring later to be laid, are not always. easy to position properly or accuratelywith reference 13011181301) surface of the concrete material 17, and it is the object of the present invention to provide simple and conveniently adjusted means for effecting the required adjustment or variations of the position of the screed 16. e

Accordingly, one form of the invention, as illustrated in Figures 1 to l inc1usive,. comprisesan anchoring element 20 oftub-ular form adapted to be embedded in the concrete material 17, and provided with prongs 21 which may be driven into the formwork 15, as shown in Figure 1, the exterior of the member 20 being knurled, grooved 'orrotherwise roughened, asindicated at 23,'for j secure retaining engagement with the concrete material. The bore of the member 20 is threaded for cooperating with a screw element 25, the shank of whichis formed with areduced neck portion or groove 26, forreceivinga locking. washer or collar 27 having the open endedslot'28 for fitting the groove 26, whereby the 106 collar or washer 27 forms a supporting eleplace either before or after the scree d l 6 been laid in position over the formworl: In the 'use of the device, it is apparent that'- it is only necessary to fit the parts through the opening in thescreed, and drive the prongs 21 into the formwork 15-,thewasher or collar '27 being inserted withinthe groove 2.6 ;in=to supporting relation tothe underrface' of the screed. Thereafter, after the concrete 7 material}?? has been poured, the screw .30 may be rotated sufiiciently in either direction to adjust the position .of the screed 1 6 into proper relation to the top surface of the-concrete material, it being intended that the j ack device remain permanently in position. Where the adjustment of the screeds position elevates this slightly .as represented in Figure 2, the final operation-merely involves the slushi' ng-o-f the space 82 with cement or concrete material to completely fill the same and thereby permanently embed the screed while the device anchors the screed into correct and accurately alined. position.

In-some instances itmaybe desired tobrace andv laterally support the. screed 16 during the .pouring of the concrete while permitting the subsequent adjustment of the, screeds positiomin which case I provide the collar elementv 27 with an angular bracing exten' S1011, 3i, term1-nat1ng 1n abase or foot por' tion 35 adaptedto be secured; by a nail or the. like to the form 15. Figure 5, the collar portion 2 provided with the, recess 28 may be applied to the screw 25 in the same manner as in the form of the device already described, and-thereafter the bracing extension B lafterbeing secured to the formwork 15 affords all the necessary lateral support to the sill, and at the same time the angular portion 84 will permit any adjustment of the jack-screw. 25 for effecting the final adjustment (of the position of the I screed, as required.

Referring now to Figures 7 to 10 inclusive, these illustrate a form of the device adapted for attachment to the sides of the'screed or. 16, as represented in Figure 10. For this mode of, use, Iprovide a sleeveelement 36in place of the collar or washer 27, this sleeve being. openfat one side andfonned Witha lug or rib for projection intothe recess or groove 26 of the screw .25, and also with laterally projecting prongs 37 adapted tobe driven into. theside faces of the sill 1 6. In Figure 8 and at the right in Figure 10, an

other variation is illustrated in the device,-

substituting for the interior lug or rib 3.7 a

As illustrated in lateral extension 39 projecting over and housing the upper end of the screw 25 and provided with the opening 40 permittingv access to the slot of the screw for rotating the same.

The provision of the housing extension 39 for the head ofthe screw of course enables the device to eli ist the jacking function by InFigures-l2 and .Iillust-rate afurther- V modification,,ivhich is adapted to be positioned or .setz-infthe concrete material 17 in advance of the; mounting @of thesills or screeds 1,6,, whichcasethe prongs 21 of the previous modifications may be omitted and the device, simply inserted and embedded inthe concrete before the same has hardened. In this form ofthe device, provide a screed attaching-e em nt o prising s mply a heet metal blank in the form;of :a strap, 45. equipped withnail holes.- 46 andwithan open ended slotj if? v for engagement with a groove 48 adjacent the head 01651 1 screw- 25i I In the ,setting of the devioe the strap-is bent} into position .ioverly-ing the head of the screw 12 5, as; illustrated in Figure 12,-

so as to be out, .of the way-10f th Operations on the concrete surface 17 until the time comes for the laying of the screed. The-ends of the straps 45 are then turned'upward as illustrated Figure 13, and nails 49 driven through the holes-5L6 into the sidefaces of the screed. I

. It is thus :ap.

device for carrying out all the-desire'd objects of Fthe invention, including the. holding of the screed LdQWIl 1in permanently anchored position, after this has' been finally adjusted and determined by the adjusting operation of the screw'25. By means of the various forms i'llustratedit i's also apparent that a device has beenprovided which may beset in place in thesoft concrete in advanceof the mountingof the' 'screed, and then the screed secured to the device; or the device may be assembled along with the screed, either before or immediately following the pouring of the concrete, either by inserting the device through the openings 30 thereof, or by attaching. it to thezside faces of the screed in the manner illustrated and above'explained.

'Whi-l'e I have illustrated and described what I nowregard aspractical and efiicient. forms of embodiment of the invention, I desireeto reserve. the right to make whatever larent .thatl'have devised a: practical, and simple, and yet highly eflicient- HID changes or modifications 'may fairly fall within the scope of the appended claims.

Having thus described byinvention, what I claim and desire to secure by Letters Patent 1. In concrete construction, screed securing and adjusting means comprising a member adapted to be embedded in the concrete material and having terminal fastening ele- V ments for attachment to form-work, and means adapted to remain permanentlyengaged with the screed and ad ustably coopcrating with said member for varying the position of the screed.

2. In concrete construction, screed securing and adjusting means comprising an anchoring member adapted to be embedded in the concrete material andhaving terminal prongs for fastening to form-work, and an element adapted to be permanently secured to the screed and th'readedly engaging said anchoring member for adjusting the position of the screed.

8. In concrete construction, screed securing and adjusting means comprising a member adapted to be embedded in the concrete material, a screw threaded in said member, and an operative connection between said screw and screed comprising a member engaging the screed and having detachable and relative rotative engagement with the screw, and a rotative screw device having means for permanent engagement with the screed and cooperating with said member-for either raising or lowering the screed. I

4. In concrete constructiom'screed securing and adjusting means comprising a threaded anchoring sleeve for embedment in the concrete material, a screw threaded in said sleeve and having a reduced neck portion and an element engaging the screed and provided with a slot detachably engaged by the neck portion of the sleeve andoperative by axial movement ofthe screw to raise or lower the ;-:creed. In witness whereof I hereunto afiix my ERNEST O. BROSTROM.

signature. 

